Hex / Bitfield Decoder

Decode any hex register value into its constituent bit fields with a visual bit map. Define custom fields or use presets.

Live

Input

Preset

Hex Value

Field Definitions

Bit Map (16-bit)

Hex: 0x8A40

Decimal: 35392

Binary: 1000101001000000

Decoded Fields

Field	Bits	Decimal	Hex	Binary	Description
ENABLE	[15]	1	0x1	1	Enable feature
MODE	[14:12]	0	0x0	000	Operating mode
STATUS	[11:8]	10	0xA	1010	Status code
COUNT	[7:0]	64	0x40	01000000	Counter

Example input:

0x8A40 (16-bit) → ENABLE[15]=1, MODE[14:12]=0xA, STATUS[11:8]=0x4, COUNT[7:0]=0x40

Results

Engineering Notes

Bit Numbering Convention

This tool uses the standard convention where bit 0 is the least significant bit (rightmost). For a 32-bit register, bits are numbered 31 (MSB) down to 0 (LSB). This matches most hardware datasheets including JEDEC, PCI-SIG, and NVM Express specifications.

Hex Value Format

Enter hex values with or without the 0x prefix. For example, 0x8A40 and 8A40 are both valid. The tool automatically validates that all characters are valid hexadecimal digits (0-9, A-F, a-f).

Common Mistakes

Using decimal instead of hex input

The hex value field expects hexadecimal input. If you have a decimal value, use the Hex Tools converter first to convert it to hex.

Reversed MSB and LSB

MSB should always be greater than or equal to LSB. If MSB < LSB, the tool will flag an error. Double-check your datasheet bit numbering.

This tool is intended for engineering analysis and educational purposes. Values and interpretations should be validated against the applicable JEDEC, PCI-SIG, NVM Express, MIPI, vendor datasheet or other authoritative specification.

Frequently Asked Questions

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